Together these subunits are composed of 4 RNA species and approximately 80 structurally distinct proteins.
This gene encodes ribosomal protein S4, a component of the 40S subunit.
The 3 isoforms encoded by these genes are not identical, but appear to be functionally equivalent.
It has been suggested that haploinsufficiency of the ribosomal protein S4 genes plays a role in Turner syndrome; however, this hypothesis is controversial.
[4] This article incorporates text from the United States National Library of Medicine, which is in the public domain.